Abstract
In this technical note, we present a new property of relative observability, and based on this property, we propose two algorithms: the first one, that has polynomial complexity, verifies if a regular language is relatively observable; the second algorithm computes the supremal relatively observable sublanguage of a given regular language. Although the latter has exponential complexity, it is more efficient than a recently proposed algorithm, which has double exponential complexity. Moreover, the algorithm proposed here has polynomial complexity when the automaton that marks the specification language is state partition.
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